Base Core. Photo: Base Power

Base Power has just unveiled Core, a supersized 39.2-kWh home battery that it says can keep a house running for up to 36 hours and be installed in under an hour.

The Austin energy company designed Core to do two jobs: provide automatic whole-home backup during an outage and operate as part of Base’s growing virtual power plant when the grid is running.

Base says Core stores about three times the capacity of a typical home battery. Homes can get two units for 78.4 kWh of storage and up to 72 hours of backup with reduced electricity use. Actual runtime will depend on what’s running – air conditioning, for example, will drain it faster.

Core can be connected to solar, and it also has a built-in port for recharging from a portable generator. The Base app provides real-time estimates of how much backup time remains based on both current and reduced power use.